Compartmentalization is the best defense-in-depth implementation for protecting high value assets or for handling environments that have trust concerns because it is a strategy that divides the network or system into smaller segments or compartments, each with its own security policies, controls, and access rules.
Compartmentalization helps to isolate and protect the most sensitive or critical data and functions from unauthorized or malicious access, as well as to limit the damage or impact of a breach or compromise.
Compartmentalization also helps to enforce the principle of least privilege, which grants users or processes only the minimum access rights they need to perform their tasks. Therefore, compartmentalization is the correct answer.
References:
* https://www.csoonline.com/article/3667476/defense-in-depth-explained-layering-tools-and-processes- for-better-security.html
* https://www.fortinet.com/resources/cyberglossary/defense-in-depth
* https://sciencepublishinggroup.com/journal/paperinfo?journalid=542&doi=10.11648/j.ajai.20190302.11

A (75%)
B (25%)

Section: INFORMATION SECURITY PROGRAM MANAGEMENT
Explanation/Reference:

The most important reason to conduct interviews as part of the business impact analysis (BIA) process is to obtain input from as many relevant stakeholders as possible. A BIA is a process of identifying and analyzing the potential effects of disruptive events on the organization's critical business functions, processes, and resources. A BIA helps to determine the recovery priorities, objectives, and strategies for the organization's continuity planning. Interviews are one of the methods to collect data and information for the BIA, and they involve direct and interactive communication with the stakeholders who are involved in or affected by the business functions, processes, and resources. By conducting interviews, the information security manager can obtain input from as many relevant stakeholders as possible, such as business owners, managers, users, customers, suppliers, regulators, and partners. This can help to ensure that the BIA covers the full scope and complexity of the organization's business activities, and that the BIA reflects the accurate, current, and comprehensive views and expectations of the stakeholders. Interviews can also help to validate, clarify, and supplement the data and information obtained from other sources, such as surveys, questionnaires, documents, or systems. Interviews can also help to build rapport, trust, and collaboration among the stakeholders, and to increase their awareness, involvement, and commitment to the information security and continuity planning.
References = CISM Review Manual, 16th Edition, Chapter 3: Information Security Program Development and Management, Section: Business Impact Analysis (BIA), pages 178-1801; CISM Review Questions, Answers & Explanations Manual, 10th Edition, Question 65, page 602.